package com.fallsvc.re.javasesets.atest;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @auther falls_vc
 * description:
 * @date 2025/10/13  11:53
 */
public class Demo1 {
    public static void main(String[] args) {
        Map<String,Integer> m = new HashMap<>();
        Iterator<Map.Entry<String, Integer>> iterator = m.entrySet().iterator();
        TreeMap<String,Integer> treeMap = new TreeMap<>();
        ConcurrentHashMap<String,Integer> c = new ConcurrentHashMap<>();
    }
}
